I've started by writing stories from my own career and in turned out to be much easier and more fun than I thought.
Shared it with my close peer group (around 15 people) and got very positive feedback - meaning people actually wanted to talk more about the stories and asked me to share the next one with them. I don't consider this as validation of any sorts, but it motivated me to continue.
I've discussed the idea with a couple of designer friends and got 3 of them to commit to writing their own stories. This is a crucial because if I can't get other designers to share, the whole thing falls apart.